<template>
  <div>
    <el-card class="box-card">
      <div slot="header" class="clearfix header-box">
        <span>文章分类</span>
        <el-button type="primary" size="mini" @click="closeDialog">添加分类</el-button>
      </div>
      <!-- 表格区域 -->
      <el-table stype="width: 100%;" :data="cateList" border stripe>
        <el-table-column
          label="序号"
          type="index"
          width="100"
        ></el-table-column>
        <el-table-column label="分类名称" prop="cate_name"></el-table-column>
        <el-table-column label="分类别名" prop="cate_alias"></el-table-column>
        <el-table-column label="操作">
          <template v-slot="{ row }">
            <el-button
              type="primary"
              size="mini"
              @click="showEditDialog(row.id)"
              >修改</el-button
            >
            <el-button type="danger" size="mini" @click="remove(row.id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加文章分类"
      :visible.sync="addVisible"
      width="40%"
      @closed="onAddClosed"
    >
      <!-- 添加的表单 -->
      <el-form
        :model="addForm"
        :rules="addRules"
        ref="addRef"
        label-width="70px"
      >
        <el-form-item label="分类名称" prop="cate_name">
          <el-input
            v-model="addForm.cate_name"
            minlength="1"
            maxlength="10"
          ></el-input>
        </el-form-item>
        <el-form-item label="分类别名" prop="cate_alias">
          <el-input
            v-model="addForm.cate_alias"
            minlength="1"
            maxlength="15"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button size="mini" @click="addVisible = false">取 消</el-button>
        <el-button size="mini" type="primary" @click="addCate" >添 加</el-button>
      </span>
    </el-dialog>
    <!-- 修改文章分类的对话框 -->
    <el-dialog title="修改文章分类" :visible.sync="editVisible" width="40%" @closed="onEditClosed">
      <!-- 修改的表单 -->
      <el-form
        :model="editForm"
        :rules="addRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cate_name">
          <el-input v-model="editForm.cate_name"></el-input>
        </el-form-item>
        <el-form-item label="分类别名" prop="cate_alias">
          <el-input v-model="editForm.cate_alias"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button size="mini" @click="editVisible = false">取 消</el-button>
        <el-button size="mini" type="primary" @click="editCate"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'ArtCate',
  data() {
    return {
      // 控制添加对话的显示与隐藏
      addVisible: false,
      editVisible: false,
      // 文章分类列表
      cateList: [],
      // 修改表单的数据对象
      editForm: {},
      // 添加表单的数据对象
      addForm: {
        cate_name: '',
        cate_alias: ''
      },
      // 添加表单的验证规则对象
      addRules: {
        cate_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          {
            pattern: /^\S{1,10}$/,
            message: '分类名必须是1-10位的非空字符',
            trigger: 'blur'
          }
        ],
        cate_alias: [
          { required: true, message: '请输入分类别名', trigger: 'blur' },
          {
            pattern: /^[a-zA-Z0-9]{1,15}$/,
            message: '分类别名必须是1-15位的字母数字',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    async initCateList() {
      const { data: res } = await this.$http.get('/my/cate/list')
      if (res.code === 0) {
        this.cateList = res.data
      }
    },
    onAddClosed() {
      this.addVisible = true
      this.$refs.addRef.resetFields()
    },
    addCate() {
      // 表单预校验
      this.$refs.addRef.validate(async (valid) => {
        if (!valid) return
        // 发起请求
        const { data: res } = await this.$http.post(
          '/my/cate/add',
          this.addForm
        )
        if (res.code !== 0) return this.$message.error('添加分类失败！')
        this.$message.success('添加分类成功！')
        // 关闭对话框
        this.addVisible = false
        // 重新请求列表数据
        this.initCateList()
      })
    },
    // 展示编辑的对话框
    async showEditDialog(id) {
      // 1. 获取分类的基本信息
      const { data: res } = await this.$http.get('/my/cate/info', {
        params: { id }
      })

      if (res.code === 0) {
        // 2. 为 data 中的 editForm 赋值
        this.editForm = res.data
        // 3. 展示对话框
        this.editVisible = true
      }
    },
    onEditClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 修改分类
    editCate() {
      // 1. 表单预验证
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        // 2. 发起请求
        const { data: res } = await this.$http.put('/my/cate/info', this.editForm)
        // 3. 修改失败
        if (res.code !== 0) return this.$message.error('修改分类失败！')
        // 4. 修改成功：提示用户、关闭对话框、刷新列表数据
        this.$message.success('修改分类成功！')
        this.editVisible = false
        this.initCateList()
      })
    },
    // 点击了删除按钮
    async remove(id) {
      // 不允许删除前两个分类
      if (id === 1 || id === 2) return this.$message.error('管理员不允许删除这个分类！')

      // 询问用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult === 'cancel') return

      // 发起请求删除对应的分类
      const { data: res } = await this.$http.delete('/my/cate/del', {
        params: { id }
      })

      // 判断是否删除成功
      if (res.code !== 0) return this.$message.error('删除分类失败！')
      this.$message.success('删除分类成功！')
      this.initCateList()
    }
  },
  created() {
    this.initCateList()
  }
}
</script>

<style lang="less" scoped>
.header-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
</style>
